Leading an expedition in Germany, Kougami unseals the resting place of one of the alchemists that created the Core Medals in an effort to retrieve a set of lost Medals. However, upon the seal being undone, millions of Cell Medals erupt into a tower while creating a magical barrier that causes parts of Japan to flip over. As the alchemist reveals her plans to become a new OOO, Eiji and his friends are thrown into the past and must find their way back home and stop the alchemist before she destroys the world!
渡部秀
as Eiji Hino / Kamen Rider OOO
三浦涼介
as Shingo Izumi / Ankh
高田里穂
as Hina Izumi
岩永洋昭
as Akira Date / Kamen Rider Birth
君嶋麻耶
as Shintarou Gotou
有末麻祐子
as Erika Satonaka
宇梶剛士
as Kousei Kougami
甲斐まり恵
as Chiyoko Shiraishi
神尾佑
as Kiyoto Maki
山田悠介
as Uva
Taito Hashimoto
as Kazari
矢作穂香
as Mezool
